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<span class="token keyword">import</span> <span class="token punctuation">{</span> List <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;./list&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> SearchPannel <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;./search-pannel&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> toQuery<span class="token punctuation">,</span> cleanObject <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'utils'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> useMount <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;hook/use-mount&quot;</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> useDebounce <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;hook/use-debounce&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> apiUrl <span class="token operator">=</span> process<span class="token punctuation">.</span>env<span class="token punctuation">.</span><span class="token constant">REACT_APP_API_URL</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">ProjectListScreen</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>list <span class="token punctuation">,</span> setList<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>users<span class="token punctuation">,</span> setUsers<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>param<span class="token punctuation">,</span> setParam<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token string">''</span><span class="token punctuation">,</span>
    personId<span class="token operator">:</span> <span class="token string">''</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token keyword">const</span> debouncedParam <span class="token operator">=</span> <span class="token function">useDebounce</span><span class="token punctuation">(</span>param <span class="token punctuation">,</span> <span class="token number">200</span><span class="token punctuation">)</span>
  <span class="token function">useEffect</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>apiUrl<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">/projects?</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span><span class="token function">toQuery</span><span class="token punctuation">(</span><span class="token function">cleanObject</span><span class="token punctuation">(</span>debouncedParam<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token keyword">async</span> <span class="token parameter">res</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>res<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">setList</span><span class="token punctuation">(</span><span class="token keyword">await</span> res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>debouncedParam<span class="token punctuation">]</span><span class="token punctuation">)</span>

  <span class="token function">useMount</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>apiUrl<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">/users</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token keyword">async</span> <span class="token parameter">res</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>res<span class="token punctuation">.</span>ok<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">setUsers</span><span class="token punctuation">(</span><span class="token keyword">await</span> res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token keyword">return</span> <span class="token punctuation">(</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">SearchPannel</span></span> <span class="token attr-name">param</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>param<span class="token punctuation">}</span></span> <span class="token attr-name">setParam</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>setParam<span class="token punctuation">}</span></span> <span class="token attr-name">users</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>users<span class="token punctuation">}</span></span><span class="token punctuation">/&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span><span class="token class-name">List</span></span> <span class="token attr-name">list</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>list<span class="token punctuation">}</span></span> <span class="token attr-name">users</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>users<span class="token punctuation">}</span></span><span class="token punctuation">/&gt;</span></span><span class="token plain-text">
    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
  <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><p>src/screens/project-list/list.tsx</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> User <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./search-pannel'</span>
<span class="token keyword">interface</span> <span class="token class-name">Project</span> <span class="token punctuation">{</span>
  id<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  name<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  personId<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  organization<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  created<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">interface</span> <span class="token class-name">ListProps</span> <span class="token punctuation">{</span>
  list<span class="token operator">:</span> Project<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
  users<span class="token operator">:</span> User<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">List</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> list<span class="token punctuation">,</span> users <span class="token punctuation">}</span><span class="token operator">:</span> ListProps</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">(</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>table</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>thead</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tr</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
        </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">名称</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
        </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>th</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">负责人</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>th</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tr</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>thead</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tbody</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
        </span><span class="token punctuation">{</span>
          list<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">project</span> <span class="token operator">=&gt;</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>tr</span> <span class="token attr-name">key</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>project<span class="token punctuation">.</span>id<span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
            </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>project<span class="token punctuation">.</span>name<span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
            </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>td</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>users<span class="token punctuation">.</span><span class="token function">find</span><span class="token punctuation">(</span><span class="token parameter">user</span> <span class="token operator">=&gt;</span> user<span class="token punctuation">.</span>id <span class="token operator">===</span> project<span class="token punctuation">.</span>personId<span class="token punctuation">)</span><span class="token operator">?.</span>name <span class="token operator">||</span> <span class="token string">'未知'</span><span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>td</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
          </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tr</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>tbody</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>table</span><span class="token punctuation">&gt;</span></span>
  <span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><p>src/screens/project-list/search-pannel.tsx</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">User</span> <span class="token punctuation">{</span>
  id<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  name<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  email<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  title<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  organization<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">interface</span> <span class="token class-name">SearchPannelProps</span> <span class="token punctuation">{</span>
  users<span class="token operator">:</span> User<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  param<span class="token operator">:</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
    personId<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  setParam<span class="token operator">:</span> <span class="token punctuation">(</span>param<span class="token operator">:</span> SearchPannelProps<span class="token punctuation">[</span><span class="token string">'param'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">SearchPannel</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> param<span class="token punctuation">,</span> setParam<span class="token punctuation">,</span> users <span class="token punctuation">}</span><span class="token operator">:</span> SearchPannelProps</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>param<span class="token punctuation">.</span>name<span class="token punctuation">}</span></span> <span class="token attr-name">onChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token parameter">e</span> <span class="token operator">=&gt;</span> <span class="token function">setParam</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token operator">...</span>param<span class="token punctuation">,</span>
        name<span class="token operator">:</span> e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span></span><span class="token punctuation">/&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>select</span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>param<span class="token punctuation">.</span>personId<span class="token punctuation">}</span></span> <span class="token attr-name">onChange</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token parameter">e</span> <span class="token operator">=&gt;</span> <span class="token function">setParam</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        <span class="token operator">...</span>param<span class="token punctuation">,</span>
        personId<span class="token operator">:</span> e<span class="token punctuation">.</span>target<span class="token punctuation">.</span>value
      <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
        </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>option</span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token string">''</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">负责人</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>option</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
        </span><span class="token punctuation">{</span>
          users<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">user</span> <span class="token operator">=&gt;</span> <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>option</span> <span class="token attr-name">key</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>user<span class="token punctuation">.</span>id<span class="token punctuation">}</span></span> <span class="token attr-name">value</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>user<span class="token punctuation">.</span>id<span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>user<span class="token punctuation">.</span>name<span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>option</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>select</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
  </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">&gt;</span></span>
<span class="token punctuation">}</span>
</code></pre></div><p>src/utils/index.ts</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token comment">// export const isFalsy = (value: any): boolean =&gt; (value === 0 ? false : !value);</span>
<span class="token keyword">const</span> <span class="token function-variable function">isFalsy</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token parameter">value<span class="token operator">:</span> unknown</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function-variable function">boolean</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">value</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>value <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">?</span> <span class="token boolean">false</span> <span class="token operator">:</span> <span class="token operator">!</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">cleanObject</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">object<span class="token operator">:</span> object</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token operator">...</span>object <span class="token punctuation">}</span><span class="token punctuation">;</span>

  Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">key</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// @ts-ignore</span>
    <span class="token keyword">const</span> value <span class="token operator">=</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token comment">// @ts-ignore</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFalsy</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">delete</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">return</span> obj<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">toQuery</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">obj<span class="token operator">:</span> any</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFalsy</span><span class="token punctuation">(</span>obj<span class="token punctuation">)</span> <span class="token operator">||</span> <span class="token keyword">typeof</span> obj <span class="token operator">!==</span> <span class="token string">&quot;object&quot;</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token string">&quot;&quot;</span><span class="token punctuation">;</span>

  <span class="token keyword">let</span> str <span class="token operator">=</span> <span class="token string">&quot;&quot;</span><span class="token punctuation">;</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> key <span class="token keyword">in</span> obj<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    str <span class="token operator">+=</span> <span class="token string">&quot;&amp;&quot;</span> <span class="token operator">+</span> key <span class="token operator">+</span> <span class="token string">&quot;=&quot;</span> <span class="token operator">+</span> obj<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><p>src/hook/use-mount.ts</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> useEffect <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;react&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">useMount</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token function-variable function">cb</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">useEffect</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">cb</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><p>src/hook/use-debounce.ts</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> useEffect<span class="token punctuation">,</span> useState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;react&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">useDebounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">value<span class="token operator">:</span> any<span class="token punctuation">,</span> delay<span class="token operator">?</span><span class="token operator">:</span> number</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>debouncedValue<span class="token punctuation">,</span> setDebouncedValue<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token function">useEffect</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">setDebouncedValue</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">,</span> delay<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 返回的这个函数在上一次的useEffect运行完后再运行，一般可以用于一些清理的工作</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>value<span class="token punctuation">,</span> delay<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">return</span> debouncedValue<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// 用来忽略下面的ts报错</span>
<span class="token comment">// @ts-ignore</span>
<span class="token keyword">const</span> value <span class="token operator">=</span> obj<span class="token punctuation">[</span><span class="token string">'name'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="ts知识梳理、总结与提高"><a href="#ts知识梳理、总结与提高" class="header-anchor">#</a> TS知识梳理、总结与提高</h2> <p>TS是强力型版的JS，当我们在代码中定义变量的时候，TS允许我们在定义的同时指定类型，这样使用者在使用不当的时候就会被及时报错提醒。</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">interface</span> <span class="token class-name">SearchPannelProps</span> <span class="token punctuation">{</span>
  users<span class="token operator">:</span> User<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
  param<span class="token operator">:</span> <span class="token punctuation">{</span>
    name<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
    personId<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  setParam<span class="token operator">:</span> <span class="token punctuation">(</span>param<span class="token operator">:</span> SearchPannelProps<span class="token punctuation">[</span><span class="token string">'param'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">SearchPannel</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">{</span> param<span class="token punctuation">,</span> setParam<span class="token punctuation">,</span> users <span class="token punctuation">}</span><span class="token operator">:</span> SearchPannelProps<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
</code></pre></div><p>经常用帖子的感受。比起原来的js，ts带来了完全不一样的体验，bug大大减少了，编译器提示快了，代码更易读了，开发速度快了。</p> <h3 id="ts-的类型"><a href="#ts-的类型" class="header-anchor">#</a> TS 的类型</h3> <p>在本节中我们使用了八种数据类型。number、string、boolean、函数、array、any、void、object</p> <h4 id="number"><a href="#number" class="header-anchor">#</a> number</h4> <p>数字类型，包含小数和其他进制的数字</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> decimal<span class="token operator">:</span> <span class="token builtin">number</span> <span class="token operator">=</span> <span class="token number">6</span>
</code></pre></div><h4 id="string"><a href="#string" class="header-anchor">#</a> string</h4> <p>字符串</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> color<span class="token operator">:</span> <span class="token builtin">string</span> <span class="token operator">=</span> <span class="token string">'red'</span>
</code></pre></div><h4 id="array"><a href="#array" class="header-anchor">#</a> array</h4> <p>在TS中，array一般指<code>所有元素类型相同</code>的值的集合</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> list<span class="token operator">:</span> <span class="token builtin">Array</span><span class="token operator">&lt;</span><span class="token builtin">number</span><span class="token operator">&gt;</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">]</span>

<span class="token keyword">interface</span> <span class="token class-name">User</span> <span class="token punctuation">{</span>
  name<span class="token operator">:</span> <span class="token builtin">string</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> john <span class="token operator">=</span> <span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'john'</span> <span class="token punctuation">}</span>
<span class="token keyword">const</span> jack <span class="token operator">=</span> <span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'jack'</span> <span class="token punctuation">}</span>
<span class="token keyword">let</span> list <span class="token operator">=</span> <span class="token punctuation">[</span>john<span class="token punctuation">,</span> jack<span class="token punctuation">]</span>
</code></pre></div><p>下面这种混合类型的数组，在TS中叫做 tuple 。</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">let</span> arr <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token string">'hello'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">]</span>
</code></pre></div><h4 id="boolean"><a href="#boolean" class="header-anchor">#</a> boolean</h4> <p>布尔值</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> isDone<span class="token operator">:</span> <span class="token builtin">boolean</span> <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="函数"><a href="#函数" class="header-anchor">#</a> 函数</h4> <p>在JS上直接声明参数和返回值</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> isFalsy <span class="token operator">=</span> <span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">boolean</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>value <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">?</span> <span class="token boolean">false</span> <span class="token operator">:</span> <span class="token operator">!</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>直接声明函数类型</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> <span class="token function-variable function">isFalsy</span><span class="token operator">:</span> <span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function-variable function">boolean</span> <span class="token operator">=</span> <span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>value <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">?</span> <span class="token boolean">false</span> <span class="token operator">:</span> <span class="token operator">!</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="any"><a href="#any" class="header-anchor">#</a> any</h4> <p>any表示这个值可以是任何值，被定义为any就意味着不做任何类型检查。</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> name<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token string">'f'</span>
<span class="token comment">// 从常规理解 name 一般应该赋值为字符串类型，但是在下面我们给name赋值了一个 number 类型也是不会报错的，因为上面我们将name指定为了any类型。</span>
name <span class="token operator">=</span> <span class="token number">18</span>
</code></pre></div><h4 id="void"><a href="#void" class="header-anchor">#</a> void</h4> <p>大部分情况下void用于表示函数不返回任何值或者返回undefined</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> <span class="token function-variable function">useMount</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token function-variable function">cb</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">useEffect</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">cb</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><h4 id="object"><a href="#object" class="header-anchor">#</a> object</h4> <p>除了number、string、boolean、bigint、symbol、null、undefined其他基本都是object</p> <h4 id="tuple"><a href="#tuple" class="header-anchor">#</a> tuple</h4> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> <span class="token punctuation">[</span>users<span class="token punctuation">,</span> setUsers<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
</code></pre></div><p>tuple是数量固定，类型可以任意版的数组。</p> <p>在React中有可能使用 tuple 的地方就是 custom hook 的返回值，注意 isHappy -&gt; tomIsHappy 以及其他名字的变化，这里使用 tuple 的好处就显现出来了：便于使用者重命名</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> <span class="token function-variable function">useHappy</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token punctuation">[</span>isHappy<span class="token punctuation">,</span> makeHappy<span class="token punctuation">,</span> makeUnHappy<span class="token punctuation">]</span>
<span class="token punctuation">}</span>

<span class="token keyword">const</span> <span class="token function-variable function">someComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>tomIsHappy<span class="token punctuation">,</span> makeTomHappy<span class="token punctuation">,</span> makeTomUnHappy<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useHappy</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div><h4 id="enum"><a href="#enum" class="header-anchor">#</a> enum</h4> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">enum</span> Color <span class="token punctuation">{</span>
  Red<span class="token punctuation">,</span>
  Blue
<span class="token punctuation">}</span>

<span class="token keyword">let</span> c<span class="token operator">:</span> Color <span class="token operator">=</span> Color<span class="token punctuation">.</span>Red
</code></pre></div><h4 id="null-和-undefined"><a href="#null-和-undefined" class="header-anchor">#</a> null 和 undefined</h4> <p>null和undefined在TS中既是值也是类型</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> u<span class="token operator">:</span> <span class="token keyword">undefined</span> <span class="token operator">=</span> <span class="token keyword">undefined</span>
<span class="token keyword">const</span> n<span class="token operator">:</span> <span class="token keyword">null</span> <span class="token operator">=</span> <span class="token keyword">null</span>
</code></pre></div><h4 id="unknown"><a href="#unknown" class="header-anchor">#</a> unknown</h4> <p>unknown 表示这个值可以是任何值</p> <p>unknown 的用法：在想用any的时候用 unknown 代替，unknown 是一个严格版的 any</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">const</span> <span class="token function-variable function">isFalsy</span><span class="token operator">:</span> <span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">unknown</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function-variable function">boolean</span> <span class="token operator">=</span> <span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>value <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">?</span> <span class="token boolean">false</span> <span class="token operator">:</span> <span class="token operator">!</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>注意： unkonwn类型不能赋值给其他类型</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> a<span class="token operator">:</span> <span class="token builtin">unknown</span> <span class="token operator">=</span> <span class="token string">'d'</span>
<span class="token keyword">let</span> b <span class="token operator">=</span> <span class="token number">1</span>
b <span class="token operator">=</span> a<span class="token punctuation">;</span> <span class="token comment">// 报错 Type 'unknown' is not assignable to type 'number'</span>
</code></pre></div><p>但是这样是可以的</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">let</span> a<span class="token operator">:</span> <span class="token builtin">unknown</span>
<span class="token keyword">let</span> b <span class="token operator">=</span> a <span class="token comment">// 因为b并没有指定是什么类型的值，在将a赋值给b的时候，b被推断为了 unknown 类型</span>

<span class="token comment">// 这样也不会报错</span>
<span class="token keyword">let</span> c<span class="token operator">:</span> <span class="token builtin">unknown</span>
<span class="token keyword">let</span> d<span class="token operator">:</span> <span class="token builtin">unknown</span>
d <span class="token operator">=</span> c
</code></pre></div><h4 id="never"><a href="#never" class="header-anchor">#</a> never</h4> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token comment">// func 返回的就是 never 类型，用到的情况比较少，一般在类型操作等场景可能会用到</span>
<span class="token keyword">const</span> <span class="token function-variable function">func</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div><h4 id="interface"><a href="#interface" class="header-anchor">#</a> interface</h4> <p>interface 是接口，可以用于创建我们自己的类型</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">interface</span> <span class="token class-name">User</span><span class="token punctuation">{</span>
  id<span class="token operator">:</span> <span class="token builtin">number</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> u<span class="token operator">:</span> User <span class="token operator">=</span> <span class="token punctuation">{</span> id<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span>
</code></pre></div><p>.d.ts文件可以让JS文件继续维持自己JS文件的身份，而拥有TS的类型保护。一般我们写业务代码不会写这个文件。</p> <h2 id="学习泛型-用泛型增强usedebounce类型灵活性"><a href="#学习泛型-用泛型增强usedebounce类型灵活性" class="header-anchor">#</a> 学习泛型，用泛型增强useDebounce类型灵活性</h2> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">function</span> <span class="token function">getValue</span><span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">number</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> value
<span class="token punctuation">}</span>
</code></pre></div><p>上面我们定义的一个 getValue 函数，它的参数和返回值都是 number 类型。如果我们想让这个函数支持更多种数据类型该怎么办呢？比如说我们希望传入 string 返回 string ，这个时候我们就使用到了泛型。先看效果：</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">function</span> <span class="token generic-function"><span class="token function">getValue</span><span class="token generic class-name"><span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span></span></span><span class="token punctuation">(</span>value<span class="token operator">:</span><span class="token constant">T</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token constant">T</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> value
<span class="token punctuation">}</span>

<span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// 1</span>
<span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token string">'a'</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// 'a'</span>
<span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// true</span>
<span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">getValue</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token comment">// {}</span>
</code></pre></div><p>我们给 getValue 函数添加了类型变量 T , T 可以帮我们捕获用户传入的类型（如： string）。后面我们就可以使用这个类型来指定函数参数及返回值的类型，大大方便了，代码的重用性。</p> <p>下面我们把之前的 useDebounce 使用泛型改造下，以便它能支持更多的数据类型。</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> useEffect<span class="token punctuation">,</span> useState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;react&quot;</span><span class="token punctuation">;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> useDebounce <span class="token operator">=</span> <span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>value<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">,</span> delay<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>debouncedValue<span class="token punctuation">,</span> setDebouncedValue<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token function">useEffect</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">setDebouncedValue</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">,</span> delay<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">// 返回的这个函数在上一次的useEffect运行完后再运行，一般可以用于一些清理的工作</span>
    <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>value<span class="token punctuation">,</span> delay<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token keyword">return</span> debouncedValue<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="用-hook-ts-ts泛型实现usearray"><a href="#用-hook-ts-ts泛型实现usearray" class="header-anchor">#</a> 用 Hook + TS + TS泛型实现useArray</h2> <p>src/hook/use-array.ts</p> <div class="language-ts extra-class"><pre class="language-ts"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> useState <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;react&quot;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> useArray <span class="token operator">=</span> <span class="token operator">&lt;</span><span class="token constant">T</span><span class="token operator">&gt;</span><span class="token punctuation">(</span>initialArray<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">[</span>value<span class="token punctuation">,</span> setValue<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token function">useState</span><span class="token punctuation">(</span>initialArray<span class="token punctuation">)</span>
  <span class="token keyword">return</span> <span class="token punctuation">{</span> 
    value<span class="token punctuation">,</span>
    <span class="token function-variable function">clear</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">setValue</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
    <span class="token function-variable function">removeIndex</span><span class="token operator">:</span> <span class="token punctuation">(</span>index<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> arr <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token operator">...</span>value<span class="token punctuation">]</span>
      arr<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>index<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span>
      <span class="token function">setValue</span><span class="token punctuation">(</span>arr<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span> 
    <span class="token function-variable function">add</span><span class="token operator">:</span> <span class="token punctuation">(</span>item<span class="token operator">:</span> <span class="token constant">T</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">setValue</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
        <span class="token operator">...</span>value<span class="token punctuation">,</span>
        item
      <span class="token punctuation">]</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>src/screens/project-list/ts-react-test.tsx</p> <div class="language-tsx extra-class"><pre class="language-tsx"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> useMount <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&quot;hook/use-mount&quot;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> useArray <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'hook/use-array'</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> <span class="token function-variable function">TsReactTest</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> persons<span class="token operator">:</span> <span class="token punctuation">{</span>name<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">;</span> age<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span>
    <span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'f'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">19</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
    <span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'g'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">18</span> <span class="token punctuation">}</span>
  <span class="token punctuation">]</span>
  <span class="token keyword">const</span> <span class="token punctuation">{</span> value<span class="token punctuation">,</span> clear<span class="token punctuation">,</span> removeIndex<span class="token punctuation">,</span> add <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">useArray</span><span class="token punctuation">(</span>persons<span class="token punctuation">)</span>

  <span class="token function">useMount</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// Property 'x' does not exist on type '{ name: string; age: number; }[]'.</span>
    <span class="token comment">// console.log(value.x);</span>

    <span class="token comment">// Property 'age' is missing in type '{ name: string; }' but required in type '{ name: string; age: number; }'.</span>
    <span class="token comment">// add({ name: 'l' })</span>

    <span class="token comment">// Argument of type 'string' is not assignable to parameter of type 'number'.</span>
    <span class="token comment">// removeIndex('1')</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token keyword">return</span> <span class="token punctuation">(</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">onClick</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">add</span><span class="token punctuation">(</span><span class="token punctuation">{</span> name<span class="token operator">:</span> <span class="token string">'john'</span><span class="token punctuation">,</span> age<span class="token operator">:</span> <span class="token number">22</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">add john</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">onClick</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">removeIndex</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">remove 0</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">onClick</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">clear</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
      </span><span class="token punctuation">{</span>
        value<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">person<span class="token punctuation">,</span> index</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">(</span>
          <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">style</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>marginBottom<span class="token operator">:</span> <span class="token string">'30px'</span><span class="token punctuation">}</span><span class="token punctuation">}</span></span> <span class="token attr-name">key</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span>index<span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
            </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">style</span><span class="token script language-javascript"><span class="token script-punctuation punctuation">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>color<span class="token operator">:</span> <span class="token string">'red'</span><span class="token punctuation">}</span><span class="token punctuation">}</span></span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>index<span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
            </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>person<span class="token punctuation">.</span>name<span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
            </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">{</span>person<span class="token punctuation">.</span>age<span class="token punctuation">}</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span><span class="token plain-text">
          </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
        <span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token plain-text">
    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
  <span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre></div></div> <footer class="page-edit"><!----> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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